Risk assessment of biocorrosion fracture of underground pipelines [in Ukrainian].
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 80, Issue 4
Abstract
During long-term operation of underground pipelines in certain regions of Ukraine formed environmental hazards are formed, caused by the destruction of pipelines because of soil and microbiological corrosion. Unpredictable failure in the pipeline result in significant economic losses and sufficient environmental consequences. With this in mind, prevention of failures, where the risk of biocorrosion processes is possible involving soil microorganisms, is one of the priority components of the national security of Ukraine. Corrosion of metals in the underground environment is most often associated with the life of sulphate bacteria. A set of studies to determine the corrosiveness of soil on the test sections of the track laying of gasmain (GM) pipelines of the Southern and Western regions has been carried out. It was found that the soils are soils with medium and high corrosion activity, that leads to an intensification of the corrosion process of underground pipelines. The presence of sulfate ions in the aqueous extracts of the soil on the part of the track "tap to the GDS Saki", at elevations PC 6 + 25, sample 4 and the PC 16 + 57, the sample 5 and the test site 150 m in length GM "Pasichna-Dolyna", leads to the development of microbial corrosion involving sulfate-reducing bacteria (SRB). Synthesis and comprehensive analysis of the results revealed some parts of the track laying gasmain pipelines of Western and Southern regions, where the risk biocorrosion formation processes in the underground environment involving SRB bacteria is possible. The results can serve as a complement to the corrosive action of soil maps with the allocation of plots biocorrosion processes.To assess the risk of biocorrosion destruction of underground metal structures, the most important of which are oil and gas pipelines, it is necessary to carry out complex research, which includes analysis of the soil texture, acidity, humidity, soil resistivity, the presence of sulfate ions, the titer of anaerobic and aerobic microorganisms, as well as weight loss metal, which indicates the intensity of corrosion damage in the underground environment.
Authors and Affiliations
Miroslava Polutrenko, Lubomyr Poberezhny, Andrij Stanetsky
Keywords
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